Bubbles in the Broth

— October 31, 2013

By Nouriel Roubini

The trouble is that if macro-pru does not work, the interest rate would have to serve two opposing goals: economic recovery and financial stability.

As below-trend GDP growth and high unemployment continue to afflict most advanced economies, their central banks have resorted to increasingly unconventional monetary policy. An alphabet soup of measures has been served up: ZIRP (zero-interest-rate policy); QE (quantitative easing, or purchases of government bonds to reduce long-term rates when short-term policy rates are zero); CE (credit easing, or purchases of private assets aimed at lowering the private sector’s cost of capital); and FG (forward guidance, or the commitment to maintain QE or ZIRP until, say, the unemployment rate reaches a certain target). Some have gone as far as proposing NIPR (negative-interest-rate policy).

And yet, through it all, growth rates have remained stubbornly low and unemployment rates unacceptably high, partly because the increase in money supply following QE has not led to credit creation to finance private consumption or investment. Instead, banks have hoarded the increase in the monetary base in the form of idle excess reserves. There is a credit crunch, as banks with insufficient capital do not want to lend to risky borrowers, while slow growth and high levels of household debt have also depressed credit demand.

As a result, all of this excess liquidity is flowing to the financial sector rather than the real economy. Near-zero policy rates encourage “carry trades” – debt-financed investment in higher-yielding risky assets such as longer-term government and private bonds, equities, commodities and currencies of countries with high interest rates. The result has been frothy financial markets that could eventually turn bubbly.